where the key quantity \(q\)  characterizes the mass asymmetry, and \(\Lambda _i\)  is the dimensionless deformability defined as [1]}, [2]}
\(\Lambda _i=\frac{2}{3}k_2\left(\frac{R_i c^2}{M_i G} \right)^5\equiv \frac{2}{3}k_2 \beta _i^{-5} , \quad i=1,2.\) 
